Junk in Japanese auctions *mostly* means the stuff is untested as hamei mentioned, but it's here mostly for seller's protection - they don't want to take responsibility even if it appears to work - most of them have no idea what are they selling, and since in Japan, "face" is extremely important they rather get lower price and not be responsible for the trouble...
Octane2 (bought in "powers on" state as Junk) - everything works except the XBOW 1.4 - it crashes the machine during heavier load.
VWS320 - junk - perfectly OK, I took it with me to Poland and swapped for a Fuel,Indy, and 2 O2's.
O2 - junk (got for 1$) - perfectly fine, but severely cracked skins.
Octane - perfectly fine.
Origin200 - all perfect.
Couple SCSI cards, terminators etc - all junk - all perfect.
So, ratio-wise, I've had pretty good luck with that junk...
Btw, about the X68k let me dig into auctions and the pricing, this doesn't seem very heavy - some 8-10KG, this means shipping to EU should be somewhere in $50-100 range... (depending whether it takes a week or 3 months